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    CWG Issue 2762</TITLE>
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<P><EM>This is an unofficial snapshot of the ISO/IEC JTC1 SC22 WG21
  Core Issues List revision 118b.
  See http://www.open-std.org/jtc1/sc22/wg21/ for the official
  list.</EM></P>
<P>2025-09-28</P>
<HR>
<A NAME="2762"></A><H4>2762.
  
Type of implicit object parameter
</H4>
<B>Section: </B>12.2.2.1&#160; [<A href="https://wg21.link/over.match.funcs.general">over.match.funcs.general</A>]
 &#160;&#160;&#160;

 <B>Status: </B>CD7
 &#160;&#160;&#160;

 <B>Submitter: </B>Jim X
 &#160;&#160;&#160;

 <B>Date: </B>2023-07-11<BR>


<P>[Accepted as a DR at the November, 2023 meeting.]</P>

<P>Subclause 12.2.2.1 [<A href="https://wg21.link/over.match.funcs.general#4">over.match.funcs.general</A>] paragraph 4 specifies:</P>

<BLOCKQUOTE>

For implicit object member functions, the type of the implicit object
parameter is
<UL>
<LI>&#8220;lvalue reference to cv X&#8221; for functions declared
without a <I>ref-qualifier</I> or with the
&amp; <I>ref-qualifier</I>
</LI>
<LI>&#8220;rvalue reference to cv X&#8221; for functions declared with
the &amp;&amp; <I>ref-qualifier</I>
</LI>
</UL>
where X is the class of which the function is a member and cv is the
cv-qualification on the member function declaration.

</BLOCKQUOTE>

<P>Since a member of some class C is also a member of any class
derived from C, this specification is unclear.</P>

<P><B>Proposed resolution (approved by CWG 2023-08-25):</B></P>

<P>Change in 12.2.2.1 [<A href="https://wg21.link/over.match.funcs.general#4">over.match.funcs.general</A>] paragraph 4 as follows:</P>

<BLOCKQUOTE>

For implicit object member functions, the type of the implicit object
parameter is
<UL>
<LI>&#8220;lvalue reference to cv X&#8221; for functions declared
without a <I>ref-qualifier</I> or with the
&amp; <I>ref-qualifier</I>
</LI>
<LI>&#8220;rvalue reference to cv X&#8221; for functions declared with
the &amp;&amp; <I>ref-qualifier</I>
</LI>
</UL>
where X is the class of which the function is a <INS>direct</INS>
member and cv is the cv-qualification on the member function
declaration.

</BLOCKQUOTE>
<BR><BR>
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